点击链接PAT乙级-AC全解汇总
点击链接PAT甲级-AC全解汇总
题目：
Calculate a+b and output the sum in standard format – that is, the digits must be separated into groups of three by commas (unless there are less than four digits).
Input Specification:
Each input file contains one test case. Each case contains a pair of integers a and b where ?10?6?? ≤a,b≤10?6?? . The numbers are separated by a space.
Output Specification:
For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.
Sample Input:
-1000000 9
Sample Output:
-999,991
题意：
求两个数字的和，然后每三位插一个逗号
我的代码：
#include<bits/stdc++.h>
using namespace std;int main()
{
int a,b;cin>>a>>b;string str=to_string(a+b);reverse(str.begin(),str.end());int index=0,flag=1;while(index<str.length()){
if(flag%4==0&&str[index]!='-'){
str.insert(index,",");index++;flag=1;}index++;flag++;}reverse(str.begin(),str.end());cout<<str<<endl;return 0;
}